EP0676306A2 - Dichtung für eine Füllstutzen-Öffnung - Google Patents

Dichtung für eine Füllstutzen-Öffnung Download PDF

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Publication number
EP0676306A2
EP0676306A2 EP95200637A EP95200637A EP0676306A2 EP 0676306 A2 EP0676306 A2 EP 0676306A2 EP 95200637 A EP95200637 A EP 95200637A EP 95200637 A EP95200637 A EP 95200637A EP 0676306 A2 EP0676306 A2 EP 0676306A2
Authority
EP
European Patent Office
Prior art keywords
pipe
filler neck
tank
opening
bead
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95200637A
Other languages
English (en)
French (fr)
Other versions
EP0676306B1 (de
EP0676306A3 (de
Inventor
Paul Phillip Briody
Randy Craig Cable
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motors Liquidation Co
Original Assignee
General Motors Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Motors Corp filed Critical General Motors Corp
Publication of EP0676306A2 publication Critical patent/EP0676306A2/de
Publication of EP0676306A3 publication Critical patent/EP0676306A3/de
Application granted granted Critical
Publication of EP0676306B1 publication Critical patent/EP0676306B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F16L41/08—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of a wall or to the axis of another pipe
    • F16L41/082—Non-disconnectable joints, e.g. soldered, adhesive or caulked joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/04—Tank inlets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
    • Y10T29/4994—Radially expanding internal tube

Definitions

  • This invention relates to a filler neck joint.
  • a filler pipe is generally routed from the surface of the body to the tank itself.
  • the filler pipe begins as a separate component that is attached to the tank at the filler neck joint thereby forming a fuel tank assembly.
  • the filler pipe may be one piece or an assembly of components with the filler neck attached to the fuel tank and the remainder of the filler pipe assembly attached to the filler neck.
  • vent pipe that conveys air from the tank during refueling.
  • the vent pipe may be integral with the filler pipe or may be separately attached to the fuel tank in a manner similar to that by which the filler pipe is attached.
  • a fuel tight seal is provided at the joint between the pipes and the fuel tank to avoid leaks.
  • a method of providing a seal at the filler neck joint is to extend the neck of the filler pipe through an opening in the fuel tank and solder the adjoining material of the two components to form an assembly.
  • a lead-tin material is used to solder the joint.
  • the filler neck may be provided with a lead-tin coating or the like to obtain a secure solder joint and provide corrosion resistance.
  • the tank generally has a corrosion resistent coating on the base metal that may have to be removed in the area to be soldered.
  • a problem with removing the coating is that the corrosion resistance aspect is defeated by exposing the base metal. Therefore, a re-application of additional corrosive resistant material may be required to obtain an acceptable corrosion free life expectancy from the assembly.
  • solder and filler neck comprised of alternative materials may be required adding expense to the tank and filler pipe assembly when using a solder joint.
  • more expensive materials may also be used when preferable to reduce the use of lead in soldered joint construction.
  • Another method of connecting a filler pipe to a fuel tank involves the use of a resilient grommet.
  • the grommet is inserted into an opening in the fuel tank and then the filler neck is clamped or fastened to the grommet.
  • the resiliency of the grommet allows it to deform and may permit excessive movement of the filler pipe relative to the tank creating problems.
  • a soldered joint provides a high resistance to separation.
  • a grommet joint provides resiliency and ease of assembly. Both assemblies have been used in automotive applications, however, both include shortcomings. Therefore, there remains a need for a durable, easily assembled filler neck joint that performs with a wide range of vehicle fuels and preserves the corrosion resistive integrity of the component parts.
  • the present invention seeks to provide an improved filler neck joint with the separation resistance characteristics of a soldered joint combined with the resiliency and assembly ease of a grommet joint to provide a leak tight seal.
  • a filler neck joint comprising a tank having a wall with an opening through the wall, a pipe extending through the opening in the tank including an annular stop bead projecting radially outward from the pipe outside the tank wall and an annular lock bead projecting radially outward from the pipe formed inside the tank wall to lock the pipe to the tank, the annular stop bead and the annular lock bead in cooperation providing the sole means for securing the pipe within the opening and a resilient annular seal interposed in the opening between the tank wall and the pipe.
  • the present invention also includes a method of assembling a filler neck joint as specified above comprising forming a circular opening in the fuel tank wall, forming an annular stop bead projecting radially outward around the pipe, positioning the resilient annular seal in the opening, inserting the pipe through the opening and the annular seal and forming an annular lock bead projecting radially outward continuously around the pipe inside the tank to provide a leak-tight seal.
  • the joint is preferably compatible with gasoline.
  • the construction is also compatible with alcohol used in systems carrying alcohol or alcohol-gasoline blends. It is also preferable that the joint permits some variance in the roundness and size of the filler neck and tank opening components of the assembly and does not require the removal of corrosion resistive coatings protecting the fuel tank and the filler neck.
  • a preferred leak tight seal is provided that eliminates the need to use solder and solder compatible coatings yet provides a durable connection with good resistance to separation or leak formation.
  • the joint preferably comprises an easily assembled construction with few component parts. Additional benefits include compatibility with alcohol and alcohol-gasoline blends and seal reliability over a wider tolerance range of tank opening size and filler neck roundness.
  • a flange with an integral ledge is preferably formed around the opening inside the tank wall.
  • the preferred flange provides increased strength in the area of the opening.
  • the preferred flange ends in a terminal edge inside the tank.
  • the tank and filler neck are preferably coated with an inexpensive corrosion resistive coating such as paint or other protective materials.
  • the filler pipe's neck preferably extends through the opening in the tank.
  • An annular bead or flange projecting radially outward is preferably formed in the pipe wall and serves as a stop. This forms a preferred stop bead in the filler neck cooperates with the tank wall to prevent the filler pipe from moving into the tank beyond its assembled position.
  • a preferred annular lock bead projects radially outward and is formed in the pipe wall inside the tank. The lock bead prevents the filler pipe from moving out of the tank beyond its assembled position. Together, the stop bead and the lock bead provide the sole means for securely locking the filler pipe to the tank with an interpositioned seal.
  • the cross section of the filler neck is designed to fit within the tank opening with enough clearance to allow the placement of a seal between the tank opening and the pipe.
  • the seal preferably exhibits an annular configuration with an L-shaped cross section and nests within the tank wall opening at the preferred ledge.
  • the seal is preferably made of nitrile rubber or a material with similar permeability characteristics. This preferred material exhibits the required resistance to fuels typically stored in vehicle tanks.
  • the filler pipe's stop bead preferably contacts one leg of the seal near the outside surface of the tank wall when the filler neck is inserted into the tank opening. After insertion the lock bead is formed around the filler pipe inside the tank wall. Formation of the lock bead preferably pulls the stop bead against the seal and compresses the seal against a preferred ledge around the interior of the tank opening. The formed lock bead preferably contacts the terminal edge of the flange giving the joint enhanced sealing characteristics.
  • the seal preferably includes a seal bead engaging the tank opening's preferred ledge.
  • the seal bead is preferably deformed when the seal is compressed in assembly optimizing the leak-tight construction of the joint.
  • the mechanically formed joint preferably provides a leak proof and resilient seal between the tank and filler pipe that exhibits good separation resistance characteristics. Preferably, rotational movement of the filler neck relative to the tank, under force, is possible without interrupting the sealing characteristics of the assembly.
  • the joint is easily assembled and compatibility with a wide range of typical vehicle fuels is achieved.
  • a fuel tank wall 11 exhibits an opening 12 for admission of a filler neck 14 into the tank's interior.
  • a filler neck is that portion of a fuel filler pipe that extends through and attaches to the fuel tank.
  • the filler neck 14 is a separate component part of the filler pipe.
  • vent 9 in the preferred embodiment extending through the filler neck 14. Alternatively vent 9 could be routed outside filler neck 14 and separately attached to the tank wall 11 similarly to filler neck 14.
  • the opening 12 is provided with an annular ledge 15 formed from part of the tank wall material when creating the opening 12.
  • a flange 16 extends into the tank from the ledge 15, surrounds the opening 12 and terminates at a terminal edge 17.
  • Seal 10 in the shape of an annular ring with a preferred L-shaped cross section engages opening 12 at ledge 15 and flange 16.
  • leg 22 of seal 10 rests in the annular seat formed by ledge 15.
  • the remaining leg 23 of seal 10 extends into the opening 12 adjacent to the flange 16.
  • the filler neck 14 Extending through the opening 12 and seal 10 is the filler neck 14.
  • the preferred form of the filler neck 14 is a section of cylindrical tubing.
  • an annular stop bead 18 that acts as a stop at the outside surface 19 of the tank wall 11 when the filler neck 14 is inserted into the opening 12.
  • the stop bead 18 exhibits surface 38 parallel to tank wall 11.
  • Formed in the wall of the tubing by mechanical deformation is continuously formed annular lock bead 20.
  • Lock bead 20 is formed continuously around the perimeter of filler neck 14 using bead-lock tooling after filler neck 14 is inserted through opening 12 and seal 10.
  • the formation of lock bead 20 pulls material from the surrounding area of the filler neck 14. This in turn results in an application of a sealing force between the filler neck 14 and flange 16 against seal leg 23.
  • the formation of lock bead 20 in the wall of filler neck 14 is sufficient, when cooperating with stop bead 18 and flange 16 to lock filler neck in position relative to tank 11.
  • Ledge 15 imparts a degree of added strength to the area of opening 12.
  • lock bead 20 comes into physical contact with the terminal edge 17 of the flange 16 thereby pulling stop bead 18 toward tank wall 11 compressing leg 22 of seal 10 between the stop bead 18 and the ledge 15.
  • stop bead 18 is biased against seal leg 22.
  • Contact between lock bead 20 and terminal edge 17 results in most of the fuel that approaches the joint being deflected away before contact with seal 10 occurs thereby enhancing the performance characteristics of the joint.
  • the joint is axisymetrical. Therefore, the joint assembly permits rotational movement of the filler neck 14, when force is applied, without interrupting the assembly's sealing ability.
  • FIG. 3 illustrates in cross section details of seal 10.
  • seal 10 Prior to assembly seal 10 exhibits an L-shaped cross section with legs 22 and 23. Integral with leg 22 is seal bead 25 that is preferred in providing a leak tight joint in the filler neck assembly.
  • the seal bead contacts the ledge 15 surrounding the opening 12.
  • stop bead 18 is pulled against tank wall 11.
  • Seal bead 25 is compressed against ledge 15.
  • the resiliency of seal 10 acts to expand seal 10 to its preassembled dimensions thereby providing a leak tight joint between tank wall 11 and filler neck 14.
  • Assembly of the joint may be performed before or after construction of the fuel tank is completed.
  • opening 12 with flange 16 is formed in tank wall 11.
  • a filler neck 14 is constructed with stop bead 18.
  • the annular seal 10 is positioned around opening 12.
  • Filler neck 14 is inserted through the seal 10 and opening 12 up to the stop bead 18.
  • Bead lock tooling is then positioned in the filler neck 14 and lock bead 20 is easily formed continuously around the perimeter if filler neck 14.
  • the assembly includes a filler neck 114 having a stop bead 118 in the shape of an annular circumferential projection.
  • the filler neck also includes lock bead 120 disposed in the opening 112 in tank wall 111 before termination of flange 116 at terminal edge 117. Therefore, the formation of lock bead 120 fixes the location of filler neck 114 within the opening and compresses seal 110 against flange 116.
  • Seal 110 exhibits a generally rectangular cross section prior to assembly. After assembly the seal conforms to the adjacent surface contour of filler neck 114 and flange 116.
  • Figure 5 illustrates another alternative embodiment of the present invention.
  • Filler neck 214 extends through opening 212 in tank wall 211.
  • stop bead 218 contacts leg 222 of L-shaped cross section seal 210.
  • Lock bead 220 when formed contacts terminal edge 217 of flange 216.
  • Seal beads 225 and 226 are formed in leg 223 of seal 210 and are disposed between filler neck 214 and flange 216 in opening 212.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
EP95200637A 1994-04-11 1995-03-16 Dichtung für eine Füllstutzen-Öffnung Expired - Lifetime EP0676306B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US225680 1994-04-11
US08/225,680 US5466016A (en) 1994-04-11 1994-04-11 Solderless filler neck joint

Publications (3)

Publication Number Publication Date
EP0676306A2 true EP0676306A2 (de) 1995-10-11
EP0676306A3 EP0676306A3 (de) 1997-04-02
EP0676306B1 EP0676306B1 (de) 1999-06-09

Family

ID=22845816

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95200637A Expired - Lifetime EP0676306B1 (de) 1994-04-11 1995-03-16 Dichtung für eine Füllstutzen-Öffnung

Country Status (4)

Country Link
US (1) US5466016A (de)
EP (1) EP0676306B1 (de)
BR (1) BR9501472A (de)
DE (1) DE69510118T2 (de)

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Also Published As

Publication number Publication date
EP0676306B1 (de) 1999-06-09
US5466016A (en) 1995-11-14
DE69510118T2 (de) 1999-10-14
DE69510118D1 (de) 1999-07-15
BR9501472A (pt) 1995-11-14
EP0676306A3 (de) 1997-04-02

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